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diff --git a/runtime/CSharp3/Sources/Antlr3.Runtime/ITokenSource.cs b/runtime/CSharp3/Sources/Antlr3.Runtime/ITokenSource.cs
deleted file mode 100644
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--- a/runtime/CSharp3/Sources/Antlr3.Runtime/ITokenSource.cs
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@@ -1,78 +0,0 @@
-/*
- * [The "BSD licence"]
- * Copyright (c) 2005-2008 Terence Parr
- * All rights reserved.
- *
- * Conversion to C#:
- * Copyright (c) 2008-2009 Sam Harwell, Pixel Mine, Inc.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. The name of the author may not be used to endorse or promote products
- * derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
- * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-namespace Antlr.Runtime
-{
-
- /** <summary>
- * A source of tokens must provide a sequence of tokens via nextToken()
- * and also must reveal it's source of characters; CommonToken's text is
- * computed from a CharStream; it only store indices into the char stream.
- * </summary>
- *
- * <remarks>
- * Errors from the lexer are never passed to the parser. Either you want
- * to keep going or you do not upon token recognition error. If you do not
- * want to continue lexing then you do not want to continue parsing. Just
- * throw an exception not under RecognitionException and Java will naturally
- * toss you all the way out of the recognizers. If you want to continue
- * lexing then you should not throw an exception to the parser--it has already
- * requested a token. Keep lexing until you get a valid one. Just report
- * errors and keep going, looking for a valid token.
- * </summary>
- */
- public interface ITokenSource
- {
- /** <summary>
- * Return a Token object from your input stream (usually a CharStream).
- * Do not fail/return upon lexing error; keep chewing on the characters
- * until you get a good one; errors are not passed through to the parser.
- * </summary>
- */
- IToken NextToken();
-
- /** <summary>
- * Where are you getting tokens from? normally the implication will simply
- * ask lexers input stream.
- * </summary>
- */
- string SourceName
- {
- get;
- }
-
- string[] TokenNames
- {
- get;
- }
- }
-}